C'mon, mate:
1. That's a pretty big statement about "everything in the world".
2. Nobody on this thread who shoots these bows is saying that everyone should shoot these bows.
3. More poundage doesn't make a hoot of difference on a bad shot.
4. I personally don't shoot more than fifty arrows in a day - to me, it isn't about the number of arrows shot, it's about the quality of each practice shot. In fact, a normal practice session or stump-shoot might only be thirty arrows.
5. From what I've read (you'll note that I'm Aussie and have never seen a whitetail), I understand that with a 45 pound bow and a razor-sharp arrow in the right place, you'll be fine.
If you can, get a hold of everything you can that's printed about bowhunting in all its forms all over the world, especially all the history of our pursuit, and devour it. Most of it isn't about bow poundage, but it'll open your eyes to the variety of possible situations, animals and experiences out there. Also, search through this forum and soak it all up. We need to be a bit philosophical about bowhunting tackle choices, as it isn't a case of "one size fits all", and very experienced hunters arrive at quite different conclusions about their personal equipment selections, and they're all right.
Good luck,
Ben